I didn't know I would get such a response.
As I stated before, I know well the mythology behind the spec. nomenclature and I know that very few games (if any) need more than 1GB/s; however, my point was that a 9800 on that system would be a waste of cash, especially when upgrading from a Ti4600. I am a big proponent of balance in a system and I believe that best balance would be achieve by either:
1) putting the $400 into purchasing a new mobo, processor, and RAM (and still have money left over)
2) putting the $400 into the bank until his next future upgrade (which looks like sept. to oct. of the year for the Hammer - at which point the 9800 will probably be at least 10-20% cheaper). At max settings, I believe the system itself would be more of a bottleneck than the videocard (which is still very good).
While the AGP 4X 1GB/s bandwidth may not be exceeded in most gaming situations (if ever), I don't see how you could rationalize paring a 9800 with a A7V266 board, or any rig which doesn't support AGP8X (regardless of whether the spec means anything or not). That is just not going to be a balanced system. For a new rig of such specs a better idea would be to buy a Ti4200 or 9500pro (and OC) and save the $250-$300; for a rig with such specs and a 4600 already installed, it would be a better idea to save the money or upgrade the rest of the system.
--------
edit: for typos